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The most popular thread used in fastening is the machine screw thread.
The machine screw thread has a 60 degree thread angle made in a continual running helix pattern.
A complete set of fastener standards can be found in the Industrial Fasteners Institute (IFI) Fasteners Standards book.
In addition to the nomenclature used to describe a thread, there is also a standard terminology to define the rest of a fastener.
This is accomplished by describing the features of a fastener.
Other features can also be added to a screw (Figure 5).
In sheet metal screw threads there is no Class of Fit.
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To indicate that a thread is a female thread a “B” is used, for example, 3B. This class of fit is used on more critical applications.
Dimensions for all thread sizes and their corresponding class of fit can be found in the ASME B1.1 Specification.